Carrier Returning iPad Air. Keep SIM card or leave in?

I am returning a T-Mobile iPad air to the local Apple store. Should I keep the SIM card I activated on T-mobile for the free 200MB, or leave it in the air when I return it?

I am not asking to steal anything. I just don't want my information leaked/given to someone else. If they wipe/discard the card, that is fine with me. As long as someone else doesn't end up getting my info, and racking up a bill to my name.

I would contact your carrier and see how they want you to handle it. Or even ask the Apple store. They surely must have dealt with this before. I would advise against withholding the SIM card when you return it.

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